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Spacetime Characteristics of the Fireball from HBT Interferometry
TPR-96-24
Space-time Characteristics of the Fireball from HBT
7 Interferometry†
9
9
1
y
a B. Tom´aˇsika,b , U. Heinza,c , U.A. Wiedemanna and Wu Y.-F.a,d
M
1
3
2 a Institut f¨ur Theoretische Physik, Universit¨at Regensburg,
v D-93040 Regensburg, Germany
1 b Faculty of Mathematics and Physics, Comenius University,
5
0 Mlynsk´a Dolina, SK-84215 Bratislava, Slovakia
4 c CERN, Theory Division, CH-1211 Geneve, Switzerland
0 d Institute of Particle Physics, Hua-Zhong Normal University,
7
9 Wuhan, China
/
h
t
-
l
c
u November 28, 1996
n
:
v
i
X
r
a
Abstract
We present the Yano-Koonin-Podgoretski˘ı parametrisation of the correlation
function. Compared to the conventionally used Cartesian parametrisation, this
one provides more straightforward measurement of the duration of the emission
process in the fireball and a clearer signal of the longitudinal expansion, which is
expected in ulrarelativistic heavy ion collisions.
† Talk presented at the Workshop on Heavy Ion Collisions, Sept. 2.–5., 1996,
Bratislava, Slovakia
1 Introduction
The study of ultrarelativistic heavy ion collisions is motivated by the prediction of QCD
lattice gauge theory that hadronic matter undergoes at energy density of 1 GeV/fm a
phase transition into the quark-gluon plasma (QGP). To determine the energy density
obtained in heavy ion collisions, a measurement of
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